This layer contains the DEM for LiDAR data from the Cheviot area captured in 2015.The DSM is available as layer [Canterbury - Cheviot LiDAR 1m DSM (2015)](http://data.linz.govt.nz/layer/3549).The index tiles are available as layer [Canterbury - Cheviot LiDAR Index Tiles (2015)](http://data.linz.govt.nz/layer/3571).The LAS point cloud and vendor project reports are available from [OpenTopography](http://opentopo.sdsc.edu/datasets).

Lidar was captured for Environment Canterbury Regional Council by Aerial Surveys on 1 April 2015, under survey name Hurunui. The datasets were generated by Aerial Surveys and their subcontractors. The survey area includes the Cheviot township area. Data management and distribution is by Land Information New Zealand.

The LiDAR sensor positioning and orientation (POS) was determined using the collected GPS/IMU datasets and Applanix POSMMS software. This work was all undertaken in NZGD2000 coordinate system using the data collected from the following basestations:

Validation was carried out using the guidelines contained in the ICSM specification template as required for this program.

Vertical Accuracy Validation:The height accuracy of the LiDAR points was checked using check points collected during the ground control survey

Horizontal Accuracy ValidationThe positional accuracy of the LiDAR data has been checked by overlaying Sounds Surveying Ltd surveyed data over the LiDAR data displayed coded by intensity. The data was found to fit well in position.

All product deliverables were initially supplied in terms of NZTM and Lyttelton 1937 height datum.

Classification of the point cloud followed the classification scheme below:0 - Created, never classified2 - Ground12 - Flight line overlap points14 - Above_Ground

Re-processing:In 2016 the data was reprocessed by Aerial Surveys for LINZ relative to the NZVD2016 vertical datum, and supplied as 1:1000 nominal scale (2500 720m high x 480m wide subtiles per full NZ Topo50 sheet). Lakes and rivers were hydroflattened in the bare earth digital elevation model.The deliverables to LINZ were: